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1-Ethyl-3-methylimidazolium-based ionic liquids, [emim]OTf, OTf = trifluoromethanesulfonate (mp = −25.7 °C), and [emim]NTf2, NTf2 = bis(trifluoromethanesulfonyl)amide (mp = −25.7 °C), have been crystallized by in situ cryo-crystallization using a zone-melting technique and found to pack via interionic C–H⋯O and F⋯F interactions.
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Choudhury et al. (2006) studied this question.
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